期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 401, 期 2, 页码 963-972出版社
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1365-2966.2009.15733.x
关键词
galaxies: ISM; gamma-rays: bursts
资金
- W. M. Keck Foundation
- Ford Foundation
- Las Cumbres Observatory Global Telescope Network
- NASA [NNG05GF55G, NNG06DO90A, NNX07AE94G, NNG06GI86G]
- US Department of Energy (DOE) [DE-FC02-06ER41453]
- NSF [AST-0548180]
- US NSF [AST-0607485]
- TABASGO Foundation
- Gary and Cynthia Bengier and the Richard and Rhoda Goldman Fund
- Miller Institute for Basic Research in Science
- Chilean Centro de Astrofi sica FONDAP [15010003]
- FONDECYT [1060823]
- STFC [ST/H002456/1, ST/G001774/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0748559] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/H002456/1, ST/G001774/1] Funding Source: researchfish
We present the discovery of an absorption-line redshift of z = 2.609 for GRB 090426, establishing the first firm lower limit to a redshift for a gamma-ray burst (GRB) with an observed duration of < 2 s. With a rest-frame burst duration of T(90z) = 0.35 s and a detailed examination of the peak energy of the event, we suggest that this is likely (at > 90 per cent confidence) a member of the short/hard phenomenological class of GRBs. From analysis of the optical-afterglow spectrum we find that the burst originated along a very low H i column density sightline, with N(H i) < 3.2 x 1019 cm-2. Our GRB 090426 afterglow spectrum also appears to have weaker low-ionization absorption (Si ii, C ii) than similar to 95 per cent of previous afterglow spectra. Finally, we also report the discovery of a blue, very luminous, star-forming putative host galaxy (similar to 2L(*)) at a small angular offset from the location of the optical afterglow. We consider the implications of this unique GRB in the context of burst duration classification and our understanding of GRB progenitor scenarios.
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